infra/helper: pass the right arguments to docker_run in reproduce_impl

[ret2libc]

def docker_run(run_args, print_output=True, architecture='x86_64'):
  """Calls `docker run`."""

the argument of docker_run(that is run_function) is print_output and I don't think err_result had the same meaning.

Without this patch, using infra/helper.py reproduce does not produce any output because the docker stdout is not printed.